Quick answer: Heat the air fryer to 400°F (200°C). Poke a whole sweet potato with a fork, rub it with a little oil and salt, and cook it for 35 to 45 minutes. Cubes take 15 to 20 minutes. Fries take 12 to 18 minutes. Shake the basket halfway for cubes and fries.
Below you will find the full time chart, step-by-step methods, what you can and cannot do, and fixes for soft or burnt results.
How to Cook Sweet Potatoes in Air Fryer
Learning how to cook sweet potatoes in air fryer is simple. The air fryer roasts them faster than a big oven. The skin gets crisp. The inside turns soft and sweet.
You can cook a whole sweet potato, cubes, fries, wedges or halves. Each cut needs a different time. If you want to know how to cook sweet potato in air fryer for one quick side or a full family batch, this guide gives you all of them in one place, so you do not need to search anywhere else.
New to air frying? Our guide on how an air fryer works explains why hot moving air crisps food with so little oil.
Why Cook Sweet Potatoes in an Air Fryer?
Once you learn how to cook sweet potatoes in air fryer baskets, you may stop using the big oven for them. Here is why.
- It is faster than the oven for small batches. Cubes are done in about 15 to 20 minutes.
- You need very little oil. One teaspoon to one tablespoon is enough.
- The edges caramelize because the hot air hits every side.
- Your kitchen stays cooler than with a full oven.
- Cleanup is easy. Most baskets go in warm soapy water.
Pros and Cons of Air Fryer Sweet Potatoes
✔ Pros
- Crisp skin and soft inside
- Uses much less oil than deep frying
- Quick for one to four servings
- No need to heat a large oven
- Works for whole, cubes, fries and wedges
✘ Cons
- Small baskets mean cooking in batches
- Large whole potatoes can take close to an hour
- Fries may stay soft if the basket is crowded
- Sugary juices can drip and smoke a little
- Times change from one air fryer model to another
What You Need
- Sweet potatoes. Pick firm ones with smooth skin and no soft spots.
- Oil with a high smoke point, such as avocado oil. See our list of the best oil for air fryer cooking.
- Salt, and any spices you like.
- A fork, a sharp knife and a cutting board.
- Tongs or a heat-safe spatula.
- Optional: an instant-read thermometer and cornstarch for crispier fries.
How Long to Cook Sweet Potatoes in Air Fryer
Time depends on the cut, the size and your machine. Use this chart as a starting point. The 400°F setting works for most cuts.
| Cut | Size | Temperature | Time |
|---|---|---|---|
| Whole (small) | 5 to 6 oz | 400°F (200°C) | 30 to 35 min |
| Whole (medium) | 7 to 9 oz | 400°F (200°C) | 35 to 45 min |
| Whole (large) | 10 to 14 oz | 380°F (195°C) | 45 to 55 min |
| Halves (cut lengthwise) | Medium potato | 400°F (200°C) | 20 to 25 min |
| Cubes | 1 inch | 400°F (200°C) | 15 to 20 min |
| Small cubes | 1/2 inch | 400°F (200°C) | 12 to 15 min |
| Fries | 1/4 to 1/2 inch sticks | 380 to 400°F | 12 to 18 min |
| Wedges | 8 per potato | 400°F (200°C) | 18 to 22 min |
| Rounds (coins) | 1/4 inch thick | 375°F (190°C) | 12 to 15 min |
| Frozen sweet potato fries | Store-bought | 400°F (200°C) | 12 to 18 min (no thawing) |
Start checking 5 minutes before the shortest time. A small basket packed full will need more time than a half-full one.
How to Cook a Sweet Potato in an Air Fryer (Whole)
This is the “baked” sweet potato. The skin crisps and the inside turns soft enough to mash with a fork.
Step 1: Wash and dry. Scrub the skin under running water. Dry it well with a towel. Dry skin crisps better.
Step 2: Poke holes. Prick the potato 6 to 8 times with a fork. This lets steam escape.
Step 3: Oil and salt. Rub about 1/2 teaspoon of oil over the skin. Sprinkle with salt.
Step 4: Preheat. Run the air fryer at 400°F for 3 to 5 minutes. Some models skip this step. Check your manual.
Step 5: Cook. Place the potato in the basket with space around it. Cook a medium one for 35 to 45 minutes. Turn it over once at the halfway point.
Step 6: Test it. Push a fork or skewer into the thickest part. It should slide in with no push back. Many cooks aim for an inside temperature of about 205°F to 210°F for the softest, fluffiest result.
Step 7: Rest and serve. Let it sit for 5 minutes. Cut it open, fluff the inside and add your toppings.
How to Cook Sweet Potato Cubes in an Air Fryer
- Peel the sweet potato, or leave the skin on for more fiber and crunch.
- Cut it into even 1-inch cubes. Same size means same cooking time.
- Toss with 1 to 2 teaspoons of oil per potato, plus salt and spices.
- Spread the cubes in one layer. Do not pile them up.
- Cook at 400°F for 15 to 20 minutes. Shake the basket every 5 to 7 minutes.
- They are done when the edges brown and a fork goes in easily.
How to Make Sweet Potato Fries in an Air Fryer
- Cut the potato into sticks about 1/4 to 1/2 inch thick.
- Optional: soak the sticks in cold water for 30 minutes. This pulls out some surface starch. Dry them fully after.
- Toss with 1 tablespoon of oil per large potato. For extra crunch, add 1 teaspoon of cornstarch and toss again.
- Lay the fries in one layer with small gaps. Cook in batches if needed.
- Cook at 380°F to 400°F for 12 to 18 minutes. Shake the basket every 5 minutes.
- Salt them right after cooking, while they are hot.
Sweet potato fries rarely get as crisp as white potato fries. They have more sugar and water. A light cornstarch coat and a single layer help the most.
How to Cook Sweet Potato Halves and Wedges
Halves: Cut a medium potato in half the long way. Brush the cut side with oil. Place it cut side down. Cook at 400°F for 20 to 25 minutes. This is the fastest way to get a soft, “baked” texture.
Wedges: Cut each potato into 8 wedges. Toss with oil and spices. Cook at 400°F for 18 to 22 minutes. Flip the wedges at the halfway point.
Note: Air fryers vary a lot. A small 2-quart basket and a large oven-style model cook at different speeds. Use the chart times as a guide, then write down what works for your own machine.
Seasoning Ideas
| Flavor | What to Add (per potato) |
|---|---|
| Classic savory | Salt, black pepper and 1/2 tsp garlic powder |
| Smoky | 1/2 tsp smoked paprika, salt and a pinch of cumin |
| Sweet | 1/2 tsp cinnamon and a pinch of salt. Add 1 tsp maple syrup or brown sugar in the last 3 minutes. |
| Spicy | 1/4 tsp chili powder or cayenne, salt and lime juice after cooking |
| Herb | Dried rosemary or thyme, salt, and grated Parmesan after cooking |
What You Can Do and What You Cannot Do
| ✔ You Can | ✘ You Cannot / Should Not |
|---|---|
| Leave the skin on. It crisps nicely and is safe to eat once washed. | Skip poking a whole potato. Trapped steam can split the skin. |
| Cook frozen store-bought fries with no thawing. | Crowd the basket. Packed fries steam and turn soft. |
| Cook without oil. The result is drier but still tasty. | Use aerosol cooking spray on a nonstick basket. Many makers warn it can damage the coating. Use a pump mister or brush instead. |
| Wrap a whole potato in foil for a softer, steamed skin. | Let foil or parchment block the air holes or touch the heating element. |
| Add sugar or syrup near the end of cooking. | Add sugar at the start. It burns before the inside cooks. |
| Cut sweet potatoes ahead and keep them in cold water in the fridge for up to a day. | Store whole raw sweet potatoes in the fridge. Cold can harden the center and change the taste. |
| Cook mixed sizes by taking out small pieces first. | Walk away for the full time on your first try. Check early. |
Common Problems and Easy Fixes
| Problem | Easy Fix |
|---|---|
| Fries are soggy | Cook fewer at once. Dry them well, add a little cornstarch, and shake often. |
| Outside burnt, inside hard | The heat is too high for the size. Drop to 375°F to 380°F and cook longer. |
| Whole potato still firm | Add 5 to 10 minutes. Large potatoes can need close to an hour. |
| Some cubes done, some raw | Cut pieces the same size and shake the basket more often. |
| Smoke from the air fryer | Sugary juice or old grease is burning. Clean the drawer and use less oil. |
| Skin is tough | Rub on a bit more oil before cooking, or wrap in foil for the first half. |
| Pieces stick to the basket | Toss the food in oil first, or brush the basket lightly. Wait a few minutes before you shake. |
How to Store and Reheat Sweet Potatoes
| Type | Where to Store | How Long |
|---|---|---|
| Raw, whole | Cool, dark, dry place. Not the fridge. | About 1 week at room temperature; longer in a cool pantry |
| Cooked leftovers | Sealed container in the fridge (40°F / 4°C or below) | 3 to 4 days |
| Cooked, frozen | Freezer bag with air pressed out | Safe while frozen; best quality within a few months |
Put leftovers in the fridge within 2 hours of cooking. The fridge times follow the FoodSafety.gov cold food storage chart. For raw storage, Michigan State University Extension advises keeping sweet potatoes out of the fridge.
To reheat: Set the air fryer to 350°F (175°C). Reheat cubes and fries for 3 to 5 minutes. Reheat halves for 6 to 8 minutes. Leftovers should reach 165°F all the way through, as listed on the FoodSafety.gov safe temperature chart.
How to Clean the Air Fryer After Sweet Potatoes
Sweet potato juice is sticky and can harden. Unplug the air fryer and let it cool. Soak the basket in warm soapy water for 10 minutes. Wipe it with a soft sponge, then dry it. Our guide on the best way to clean an air fryer covers stuck-on spots in detail.
Easy Ways to Serve Air Fryer Sweet Potatoes
- Whole potato topped with butter, cinnamon and a pinch of salt
- Stuffed with black beans, salsa and cheese
- Cubes in a grain bowl or salad
- Fries with a yogurt or garlic dip
- Mashed with a little milk and butter
- On the side of chicken, pork or fish
Want a main dish to go with them? Try our air fryer pork chops or browse more air fryer meals. If you cook plant-based, see the best air fryer for vegans.
Frequently Asked Questions
How long to cook sweet potato in air fryer?
At 400°F, a medium whole sweet potato takes 35 to 45 minutes. 1-inch cubes take 15 to 20 minutes. Fries take 12 to 18 minutes. Halves take 20 to 25 minutes.
How do I know when a sweet potato is done?
A fork slides into the thickest part with no push back. Cubes and fries will also have brown edges.
Do I need to peel sweet potatoes before air frying?
No. The skin is safe to eat and gets crisp. Just scrub it well. Peel it only if you want a softer, smoother bite.
Do I need to preheat the air fryer?
It helps fries and cubes brown faster. For a whole potato, it matters less. A 3 to 5 minute preheat is enough.
Can I cook sweet potatoes in an air fryer without oil?
Yes. They will cook fine. The skin and edges will be drier and less golden.
Why are my air fryer sweet potato fries not crispy?
The basket is usually too full, or the fries are wet. Cook one layer at a time, dry them well, and try a light coat of cornstarch.
Can I cook two sweet potatoes at once?
Yes, if there is space between them for air to move. Pick potatoes of the same size so they finish together.
Should I wrap a sweet potato in foil in the air fryer?
You can, but you do not need to. Foil gives a soft, steamed skin. Leave it unwrapped for crisp skin. Keep foil away from the heating element.
Is a yam the same as a sweet potato?
Not really. In most US stores, the orange “yams” are a type of sweet potato. True yams are a different plant. The times in this guide work for the orange sweet potatoes sold in most stores.
How long do cooked sweet potatoes last in the fridge?
Keep them in a sealed container and eat them within 3 to 4 days.
Final Words
Now you know how to cook sweet potatoes in air fryer for any cut. Use 400°F for most of them. Give whole potatoes 35 to 45 minutes, cubes 15 to 20 minutes and fries 12 to 18 minutes. Keep pieces in one layer and check early.
Shopping for a new machine first? Compare our picks for the best air fryers for low oil cooking.
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